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research article

The role of nanocrystalline binder metallic coating into WC after additive manufacturing

Cavaleiro, A. J.
•
Fernandes, C. M.
•
Farinha, A. R.
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2018
Applied Surface Science

Tungsten carbide with microsized particle powders are commonly used embedded in a tough binder metal. The application of these composites is not limited to cutting tools, WC based material has been increasingly used in gaskets and other mechanical parts with complex geometries. Consequently, additive manufacturing processes as Selective Laser Sintering (SLS) might be the solution to overcome some of the manufacturing problems. However, the use of SLS leads to resolve the problems resulting from difference of physical properties between tungsten carbide and the metallic binder, such as laser absorbance and thermal conductivity. In this work, an original approach of powder surface modification was considered to prepare WCmetal composite powders and overcome these constraints, consisting on the sputter-coating of the WC particle surfaces with a nanocrystalline thin film of metallic binder material (stainless steel). The coating improves the thermal behavior and rheology of the WC particles and, at the same time, ensures a binder homogenous distribution. The feasibility of the SLS technology as manufacturing process for WC powder sputter-coated with 13 wt% stainless steel AISI 304L was explored with different laser power and scanning speed parameters. The SLS layers were characterized regarding elemental distribution, phase composition and morphology, and the results are discussed emphasizing the role of the coating on the consolidation process. (C) 2017 Elsevier B.V. All rights reserved.

  • Details
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Type
research article
DOI
10.1016/j.apsusc.2017.08.039
Web of Science ID

WOS:000415135500015

Author(s)
Cavaleiro, A. J.
•
Fernandes, C. M.
•
Farinha, A. R.
•
Gestel, C. V.
•
Jhabvala, J.
•
Boillat, E.  
•
Senos, A. M. R.
•
Vieira, M. T.
Date Issued

2018

Publisher

Elsevier

Published in
Applied Surface Science
Volume

427

Start page

131

End page

138

Subjects

Selective laser sintering

•

Sputtering

•

Nanocrystallinity

•

WC

•

Martensitic stainless steel

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

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Available on Infoscience
January 15, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/144008
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